Romans 3 v 5-6



Romans 3:5-6
(5)  But if our unrighteousness commend the righteousness of God, what shall we say? Is God unrighteous who taketh vengeance? (I speak as a man)
(6)  God forbid: for then how shall God judge the world?


The apostle then pursued his argument with additional questions. The first is, What shall we say to the idea that the Jews’ unrighteousness served to accentuate God’s righteousness? Could they conclude that God’s wrath on Jews is therefore unjust? Paul immediately interjected, I am using a human argument, and responded with the answer, Certainly not! (mē genoito, the same response as in v. 4; cf. v. 31) If that were the case, that God were unfair in judging unfaithful Jews, then He would be barred from judging the world. And of course, that could not be. So, since God will judge the world (cf. 2:5) He will not be unfair in extending His wrath on guilty Jews (cf. 2:11).
  

Walvoord, John F. ; Zuck, Roy B. ; Dallas Theological Seminary: The Bible Knowledge Commentary : An Exposition of the Scriptures. Wheaton, IL : Victor Books, 1983-c1985